Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 11,070	$ 11,070
Accumulated depreciation	5,470	5,447
Net	5,600	5,623
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Cost	5,237	5,237
Accumulated depreciation	5,137	5,114
Net	100	123
Corporate, United States
Property, Plant and Equipment [Line Items]
Cost	333	333
Accumulated depreciation	333	333
Net	0	0
Used mill equipment, Canada
Property, Plant and Equipment [Line Items]
Cost	5,500	5,500
Accumulated depreciation	0	0
Net	$ 5,500	$ 5,500